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in Nature of Physical World and Measurement by (48.1k points)
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The mass of a box measured by a grocer’s balance is 2.3 kg. Two gold pieces 20.15 g and 20.17 g are added to the box.

(i) What is the total mass of the box ? 

(ii) The difference in masses of the pieces to correct significant figures.

1 Answer

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(i) Mass of box = 2.3 kg 

Mass of gold pieces = 20.15 + 20.17 = 40.32 g = 0.04032 kg. 

Total mass = 2.3 + 0.04032 = 2.34032 kg 

In correct significant figure mass = 2.3 kg (as least decimal) 

(ii) Difference in mass of gold pieces = 0.02 g 

In correct significant figure (2 significant fig. minimum decimal) will be 0.02 g

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